Low battery or overheating.
or if you kick it relly hard
All batteries will drain a small amount, even if they are not being used. However, a substantial battery drain would be due to a problem with the battery or laptop. Make sure that the laptop is indeed off, though. With Vista, clicking the power button in the start menu will not shut down the laptop, but will instead put it into sleep mode. This continues to drain the battery. Some of the lights on the computer will still be lit when the laptop is in sleep mode, while no lights will be on if the laptop is turned off.
the computer will shut off entirely
It is called monitor shut off. It's for the purpose of power saving. You can actually disable it or make the time too long before it shuts down by going to the properties.
please can anyone help me
yes
Yes this can cause the engine to shut off. This the main input to the engine ecu.
Peeing off the side
only if you download while shut off is in operation
Yes! Apple laptops or Macbooks charge even when they are powered off and you have shut the laptop lid.
log off or shut down. If you are already logged off shut it down. If you want to store a computer in a bag or suitcase follow the steps I gave you and take out the battery. close and save all projects or programs before logging off and shutting down.
Bad fuel pump.
Try this, press and hold the 'off' button for about 5 - 7 seconds, this should force it to shut down, when you re boot the 'bug' should resolve itself.